Display device, driving method of display device, and electronic apparatus

Abstract

A display device includes a pixel electrode and a counter electrode facing each other, a plurality of charged particles disposed between the pixel electrode and the counter electrode, an organic transistor electrically connected to the pixel electrode, a data line electrically connected to the pixel electrode via the organic transistor, a data line driving circuit supplying an image signal to the data line, and a counter electrode driving circuit supplying a counter electrode driving signal containing a pulse signal having the same polarity as the image signal to the counter electrode.

Description

BACKGROUND[0001]1. Technical Field[0002]The present invention relates to a display device including an organic transistor, a driving method of a display device, and an electronic apparatus.[0003]2. Related Art[0004]Organic semiconductors are promising future semiconductors succeeding silicon and compound semiconductors and their wide application to various electronic apparatuses are expected. In particular, development of the organic semiconductors has led to realization of thin, light and flexible devices which can be freely bent and also to realization of production of electronic price label (information tag) that can enable individual products to be managed in wireless, so research and development on practical use of the organic semiconductors are progressing. For example, a flexible display represented by electronic paper can serve as an electronic apparatus which bears a part of ubiquitous society thanks to its advantages of the ability of shock absorption and the pliability wh...

AI Technical Summary

Benefits of technology

[0006]An advantage of some aspects of the invention is that it provides a display device and a driving method thereof, which are capable of preventing lowering of contrast and occurrence of cross talk attributable to the off-current of an organic transistor. Further advantage of some aspects of the invention is that it provides an electronic apparatus including such a display device and having high flexibility and excellent display quality.

[0007]According to one aspect of the invention, there is provided a display device including a pixel electrode and a counter electrode facing each other, a plurality of charged particles disposed between the pixel electrode and the counter electrode, an organic transistor electrically connected with the pixel electrode, a data line electrically connected with the pixel electrode via the organic transistor, a data line driving circuit which supplies an image signal to the data line, and a counter electrode driving circuit which supplies a counter electrode driving signal containing a pulse signal having the same polarity as the mage signal to the counter electrode. According to this aspect, the pulse signal having the same polarity as the image signal is supplied to the counter electrode. Accordingly, even if the off-current flows through the organic transistor, it is possible to draw the charged particles in a direction which is opposite to a direction in which the charged particles move by the off-current. Accordingly, although the charged particles move to a position which is different from a position where the charged particles must essentially exist due to the off-current of the organic transistor, it is possible to detain and withhold the charged particles at the position where the charged particles must exist by the pulse signal. In this case, movement of the charged particles in pixels whose organic transistors are in an ON state is suppressed. However, in the display device using the charged particles, although the image signal is not continuously supplied, the charged particles can continuously move as long as electric field is formed by charges accumulated in the pixel electrode. Accordingly, even if supply of the image signal is temporarily suspended by the pulse signal, the movement of the charged particles may not be perfectly inhibited. As described above, according to this aspect, undesirable movement of the charged particles in the pixels whose organic transistors are in an OFF state is prevented. Accordingly, it is possible to provide a display device having excellent display quality.

Problems solved by technology

That is, under the present circumstances, the performance necessary for a switching element is not obtained by the organic transistor.

For this reason, when the number of scanning lines is increased, it happens that a voltage, which originally must not be applied, is applied to a pixel electrode due to the off-current (leak current in an OFF state) of an organic transistor, leading to deterioration of contrast and occurrence of cross talk.

However, in the display device using the charged particles, although the image signal is not continuously supplied, the charged particles can continuously move as long as electric field is formed by charges accumulated in the pixel electrode.

Accordingly, even if supply of the image signal is temporarily suspended by the pulse signal, the movement of the charged particles may not be perfectly inhibited.

As described above, whichever the pulse width of the pulse signal and the interval between the pulses of the pulse signal is set too large, such setting is unsuitable as a display, and it is necessary to set up the amplitude of the pulse signal and the interval between the pulses suitably according to desired level of contrast and the write speed of an image.

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